In the case where the provided chatRoomProvider == null simply return
null. If not, we cause an NPE.
This may (also) be fixed at the root, i.e. check that we do not pass
null, however we already have to check for null since there is another
case that potentially returns null, so we're "attaching" to already
no-chatrooms-for-null-chatroomprovider.patch (637 Bytes)